Metrosideros polymorpha, in Hawai'i. Photo / Timothy Kroessig Metrosideros polymorpha, in Hawai’i. Photo / Timothy Kroessig

This huge Metrosideros excelsa "Aurea" (gold) pōhutukawa at Okitu, near Gisborne, is believed to have been grown from seed gathered from a Northland forest more than 100 years ago. Photo / Sarah CurtisThis huge Metrosideros excelsa “Aurea” (gold) pōhutukawa at Okitu, near Gisborne, is believed to have been grown from seed gathered from a Northland forest more than 100 years ago. Photo / Sarah CurtisA grafted tree combining New Zealand's traditional red pōhutukawa (Metrosideros excelsa) with the less common yellow variety (Metrosideros excelsa "Aura"). A grafted tree combining New Zealand’s traditional red pōhutukawa (Metrosideros excelsa) with the less common yellow variety (Metrosideros excelsa “Aura”).

 Yellow and orange flowering pohutukawa in Long Bay Regional Reserve, near Auckland. Photo / Robin Kavanagh Yellow and orange flowering pohutukawa in Long Bay Regional Reserve, near Auckland. Photo / Robin Kavanagh